Titanium white waste acid concentration process

Abstract

The invention discloses a titanium white waste acid concentration process. During the process, sulfuric acid with relatively high concentration is added into waste acid firstly, so as to enable ferrite to be separated out partly, an acid liquor and the separated out ferrite are separated, ozone is introduced into the acid liquor, ferrous ions are oxidized to be ferric ions, then the ferric ions are taken out through extraction and reextraction, and finally, the sulfuric acid with the concentration of 75 to 85 percent is obtained through atmospheric distillation and reduced pressure distillation. The titanium white waste acid concentration process provided by the invention is not required to be conducted in a high temperature environment, is free from high energy consumption, and is simple in process, low in cost and suitable for large-scale industrial production.

Description

technical field

[0001] The invention relates to a process for concentrating titanium white waste acid, which belongs to the technical field of waste acid treatment. Background technique

[0002] At present, the global output value of titanium dioxide is about 11 billion US dollars, which is the third largest inorganic chemical product after synthetic ammonia and phosphoric acid. Titanium dioxide is widely used in coatings, paints, papermaking, rubber and other industries, and is closely related to people's basic necessities of life. Many countries have listed titanium dioxide as a key product that affects the development of the national economy, and per capita consumption of titanium dioxide is also regarded as an important indicator that reflects the level of a country's economic development.

[0003] Correspondingly, the production of titanium dioxide mainly adopts three methods: sulfuric acid method, chlorination method and hydrochloric acid method. In my country, 95% of ...